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(No Model.) 2 Sheets-Sheet 1. F. BLACKBURN.

FEEDING MECHANISM FOR $TRAW BRAID SEWING MAGHINBS.

No. 344,239. Patented June 22, 1886.

5y fills 0 2560 771,636

N. PETERS. PhnlcrLilhnlnpher, walhington. D. c.

(No Model.) 2 SheetsSheet 2. F. BLACKBURN.

FEEDING MECHANISM FOR STRAW BRAID SEWING MACHINES.

No. 344,239. Patented June 22, 1886.

YVZwesses fnvenor:

I ,9. WW .1773 Zaok/u/rn 6y hil s Jzbbarn/egs N. PEIERS, Pram-Litho ra hWanhm mr. DY cv UNITED STATES PATENT @FEICE.

FREDERICK BLACKBURN, OF PALMYRA, ASSIGNOR TOTHE BLACKBURN STRAWV BRAIDSEYVING MACHINE COMPANY, OF BEVERLY, N. J.

FEEDING MECHANISM FOR STRAW-BRAlD-SEWING MACHINES.

SPECIFICATION forming part of Letters Patent No. 344,239, dated June 22,1886.

Application filed July 11,1881. Serial No.137,l1 i. (No model.)

To all whom it may concern:

Be it known that I, FREDERICK B LACKBURN, a citizen of the UnitedStates, and a resident of Palmyra, New Jersey, have invented certainImprovements in Feeding Mechanism for Straw-Braid-Sewing Machines, ofwhich the following is a specification.

My invention consists of certain improvements,fully described andclaimed hereinafter, in the feeding mechanism of the machine, with theview of lessening the wear of the parts and insuring apositive feedingof the braid without wounding the latter.

In the accompanying drawings, Figure 1 is a side view, partly insection, of sufficient of a straw-braid-sewing machine to illustrate myimprovements; Fig. 2, a sectional plan on the line 1 2, Fig. 1, the headwhich guides the needle-bar and presser-bar not being shown; Fig. 3, anend view of the machine, looking in the direction of the arrow, Fig. 1;Fig. 4, a transverse section of part of the machine on the line 3 4,Fig. 2; and Fig. 5, a perspective view of part of the feeding mechanism.

The machine shown in the drawings is one of the XVillcox & Gibbs type,although it should be understood that my invention is not limited tosuch a machine, thelatter being selected simply because it is the onemost used for this class of work.

A is the frame of the machine, 13 the driving-shaft, D the needle-bar, Dthe needle-arm, E the presser-bar, and C the rotating hook, allconstructed as usual.

On the shaft B is an eccentric, F, the rod F of which has at the outerend a bolt, a, which passes through aslot, b, in an arm, b, on arockshaft, G, adapted to suitable hearings on the frame A. The bolt ahas a nut, a, by which it can be secured to the arm I) after adjustment,the throw of the arm and the extent of vibration of the rock-shaft beingthus regulated as desired. The opposite end of the rockshaft G has anarm, (1, to the upper end ofwhich is hung abar, H, the front end ofthelatter being connected to the lower feed-block, I, the upper serratedportion of which projects through an opening in the feed-table, asusual; but the lower end of the block is adapted to a V-guide in a bar,I, vertically adjustable on the frame A, so as to compensate for wear, aspring, 1", serving tohold the block firmly to its bearing on the bar.The block I has a horizontal reciprocating movement, but no verticalniovemen t, the braid being clamped against the serrated face of theblock I by the upper feed-block, J, which is carried by the front end ofan arm, K, the rear end of the latter being pivoted to the rear end ofthe bar H. In the arm K is a slot, 0, and to this slot is adapted a pin,f, on the lower end of the prcsser-bar E, so that as the latter isreciprocated and the rock-shaftG vibrated a combined longitudinal andvertical reciprocation or founmotion feed will be imparted to the blockJ, and the braid will be clamped and fed forward. By thusimparting thecombined movement to the upper block and a simple movement only to thelower block I avoid the necessity of having beneath the table a numberof guides for the lower feed-block.

It has been found in practice that the dust and grit from the braidcauses the rapid wear of any surfaces moving in contact beneath thefeed-table; hence my machine has but one guide thus located, and this isone which can be readily adjusted to compensate for wear, or readilyrenewed when worn out.

The reciprocating motion of the presser-bar E is derived from theneedlearm D, a pin, g, on which is fitted to a slot, g, in an arm, M,hung loosely to a rock-shaft, i, the latter being adapted to bearings onthe frame A, and having an arm, N, secured to it. The outer end of thearm N is connected to the arm M by a right-and-left-threaded screw-rod,71, adapted to a right-handed swiveled nut on one arm and a left-handedswiveled nut on the other, so that both arms will be caused to vibrateas the needle-arm moves, the shaitt'having athird arm, N, which actsupon a pin, 7.7, on the presserbar,and thus causes the verticalreciprocation of the latter on the vibration of the rock-shaft.

In order to adjust the presser-bar for differ ent thicknesses of braid,it is necessary simply to vary the relations of the arms M and N bymeans of the screw-rod h. Thus the movement of the arm N away from thearm M serves to elevate the presser-bar,'a reverse movement permittingits descent. Aspring, h, serves to supplement the action of thescrew-rod h in forcing the arms apart. The upper presserblock, J, isrecessed, as shown in Fig. 5, for the reception of the overlying layerof braid, so that both layers are seized by the block during the feedingmovement. The block is secured to the 'arm K byja dovetailed joint andset-screw, as shown in Figs. 3 and 5, so that it can be adjusted to suitdifferent laps ofbraid, or can be readily removed when it becomes wornor when there is a change in the characing a slot, 0, for the receptionof the pin, the

feed-block J, secured to said bar K, and devices whereby a verticalreciprocation is imparted to the presser-bar and a longitudinalreciprocation to the bar K, as set forth.

upper feed-block, J, hung to the lower end of 5 the presser-bar, andjme'ans for imparting a longitudinal reciprocation to the saidfeedblock, as set forth.

4. The combination of the needle-arm, the rock-shaft i, having a loosearm, M, connected to said needle-arm, a fixed arm, N, adj ustablyconnected to said arm M, and an arm, N, acting on the resser-bar,feed-blocks I and J, and mechanism for reciprocating said feed-blocks,all substantially as specified.

5. The combination of the feed-operating mechanism of astraw-braid-sewing machine, the lower feed-block, the presserbaryand alaterally-adj ustablev upperieed-blockrecessed for the reception of theupper layer of braid, as set forth.

In testimony whereof [have signed m'yn'ar'ne to this specification inthe presence of two subscribing witnesses.

, FREDERICK BLACKBURN.

\Vitnesses:

JOHN E. PARKER, HARRY SMITH.

